Add powershell completion

[douglaswth]

No description provided.

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[k8s-ci-robot]

Hi @douglaswth. Thanks for your PR.

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[stmcginnis]

Seems reasonable since we do publish Windows binaries.

/lgtm
/ok-to-test

[stmcginnis]

/lgtm

Thanks!

[BenTheElder]

for reference: https://github.com/spf13/cobra/blob/main/site/content/completions/_index.md#creating-your-own-completion-command

[BenTheElder]

/lgtm
/approve
thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, douglaswth

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